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Wireless communication: Global positioning system

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  1. Introduction
  2. Meaning of global positioning system - GPS
  3. Portable GPS uses
  4. The future of GPS
  5. Navigation systems and GPS signals
  6. The GPS constellations
  7. Applications
  8. Conclusion
  9. References

GPS technology is one of the significant inventions of the twentieth century. GPS has become a popular device in western countries but has not yet reached the household of the common man in India. With globalization, GPS and its related technology have been unable to penetrate the heart of Indian consumers. This thesis studies what the factors that prevent GPS from being used widely in India are. The actual application of the GPS technology is what leads to such things as navigation systems, GPS tracking devices, GPS surveying and GPS mapping. GPS in itself does not provide any functionality beyond being able to receive satellite signals and calculate position information. The Global Positioning System (GPS) has revolutionized the field of navigation all over the world. Initially create just for military uses, to locate ground forces and to direct their movements with accurate precision as to their destinations, GPS now is available everywhere for commercial use. Keywords: Satellite signals, Constellation, Navigation, position.

[...] President Bill Clinton issued a policy directive[13] declaring GPS to be a dual-use system and establishing an Interagency GPS Executive Board to manage it as a national asset. In 1998, U.S. Vice President Al Gore announced plans to upgrade GPS with two new civilian signals for enhanced user accuracy and reliability, particularly with respect to aviation safety. On May "Selective Availability" was discontinued as a result of the 1996 executive order, allowing users to receive a non-degraded signal globally. In 2004, the United States Government signed a historic agreement with the European Community establishing cooperation related to GPS and Europe's planned Galileo system. [...]


[...] With a GPS receiver connected to a GPS antenna, a user can receive the GPS signals, which can be used to determine his or her position anywhere in the world. GPS is currently available to all users worldwide at no direct charge. Fig Fig Calculating Position 4. GPS SEGMENTS Global Positioning System is composed of three segments Space segment 2. Control segment 3. User segment SPACE Segment: It consists of total 28 satellites from which 24 are operative and 4 are spares. [...]


[...] Fig Since all of the global positioning satellites have highly accurate atomic clocks within them, electronic products are being designed to tap into update time. Several lines of new watches and clocks now automatically update themselves from the GPS network. This synchronization helps users by giving them a more uniformed time structure. Changes for daylight savings can happen automatically for all clocks that use this technology. In case of a power failure, clocks and VCRs will automatically reset to the proper time as soon as power is restored. [...]

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